Lock for slidably mounted closures



Aug. 23, 1966 c. M QulsToN 3,267,613

LOCK FOR SLIDABLY MOUNTED CLOSURES Filed Feb. 25. 1965 imw%m 7 AT T 012N151 United States Patent 3,267,613 LOCK FOR SLIDABLY MOUNTED CLOSURES Denny C. McQuiston, 4824 W. Eucanto Blvd., Phoenix, Ariz. Filed Feb. 25, 1965, Ser. No. 435,204 2 Claims. (Cl. 49449) This invention pertains to an improved locking device of sliding doors and is particularly directed to a lock for slidably mounted door closures of the Arcadia door type.

One of the objects of this invention is to provide an improved lock for such sliding door closures which is of simple and durable construction and which can be readily and easily applied to existing doors as well as to doors in the course of manufacture and which lock device can be marketed at a reasonably low cost.

Still another object of this invention is to provide a lock for slidable closure doors and the like which is adapted to securely lock and hold a sliding closure element against a sill or other abutment to prevent its relative movement thereto.

It is also a further object of this invention to provide a locking device applicable to a sliding closure door and the like closely adjacent the heel thereof and engaging the operating track upon which the door element slides to positively lock the door against any opening movement when the lock is in operative position.

A further object of this invention is to provide a locking means particularly in connection with sectional sliding closures such, for example, as sliding doors of the Arcadia type, cabinet doors, lockers, garage doors, windows, and similar type of sliding enclosure elements, which prevents unauthorized operation of the closures while at the same time providing a simple, positive, inexpensive, and easily manipulated lock capable of movement from a release to a locked position with a minimum of effort.

Further features and advantages of this invention will appear from a detailed description of the drawings in which:

FIG. 1 is a perspective view showing the door lock of this invention in released position.

FIG. 2 is a view similar to FIG. 1 but showing the lock in operative securing position.

FIG. 3 is an enlarged fragmentary end elevation of the closure door showing the lock device in released position.

FIG. 4 is an enlarged fragmentary sectional view on the line 4--4 of FIG. 2 showing the lock in locked position.

FIG. 5 is an enlarged fragmentary perspective View of the top of the door showing the lift-up prevent mechanism.

As an example of one embodiment of this invention, there is shown a lock for slidably mounted closures comprising a door sill having a track 11 upon which moves the closure door 12 in the customary manner.

The lock device of this invention comprises a swinging arm 13 having a horizontally disposed portion 14 pivotally journaled to rock about a horizontal axis 15 which is parallel to the direction of the door movement in a bearing bracket 16 fixed to the inside surface 17 of the door 12 by suitable screws 18. A radially outwardly extending portion 19 of swinging arm 13 is rigidly formed with one end of the portion 14 adjacent the edge 20 6 of the door 12 and has a turned over portion 21 formed with its other outer end. A further locking pin portion 22 formed on the outer end of the portion 21 is adapted to swing down, FIG. 4, into a notch 23 cut in the sill 10 when the door 12 is in closed position. When swung up to released position, FIG. 3, the turned over portion 21 is received in a releasable securing clip 23a secured to the edge 20 of the door 12 by a suitable fastening screw 24 so as to be held in inoperative position on the door as it is slid to or from closed position.

To prevent the door 12 being lifted from the track 11 and upwardly of the sill 10 to release the swinging arm 13 from the notch 23 to allow sliding of the door to open position there is provided an abutment strip 25 having an elongated slot 26 through which passes the screw 27 for securing the strip 25 to the edge 20 of the door 12 with its top edge engaging the top track of the door frame to make the door with the lock 13 fully enter-proof.

While the apparatus herein disclosed and described constitutes a preferred form of the invention, it is also to be understood that the apparatus is capable of mechanical alteration without departing from the spirit of the invention and that such mechanical arrangement and commercial adaptation as fall within the scope of the appendent claims are intended to be included herein.

Having thus fully set forth and described this invention what is claimed and desired to be obtained by United States Letters Patent is:

1. A lock for a slidably mounted closure door comprising in combination:

(A) a swinging arm having,

(B) a horizontally disposed portion pivotally journaled on the inside surface of the door for swinging about a horizontal axis parallel to the door movement,

(C) a radially outwardly extending portion from one end of said horizontally disposed portion arranged to abuttingly engage the end of said door,

(D) and a locking pin portion formed on the outer end of said last mentioned portion extending at right angles to said radially extending portion in a plane parallel to said end of said door,

(E) a door sill including a locking notch to receive said locking pin portion,

(F) a track on said door sill for slidingly supporting the door,

(G) said arm being adapted to be swung downwardly from a position against said door end face into the bottom of said notch so as to present said locking pin portion in said notch when said door is in closed position on said sill.

2. A lock for a slidably mounted closure door as set forth in claim 1 wherein a releasable securing clip is mounted on said door end face arranged to hold said arm in upwardly swung unlocked position when said door is in opened and sliding condition.

References Cited by the Examiner UNITED STATES PATENTS 233,644 10/1880 Towne.

447,182 2/1891 Hix. 1,119,903 12/1914 Vissering. 1,376,697 5/1921 Jager. 2,700,801 2/1955 Pierson 2052.8 2,973,561 3/1961 Jackson 20-16 X 3,174,782 3/ 1965 Duhm.

FOREIGN PATENTS 522,545 3/1956 Canada.

HARRISON R. MOSELEY, Primary Examiner. KENNETH DOWNEY, Examiner. 

1. A LOCK FOR A SLIDABLY MOUNTED CLOSURE DOOR COMPRISING IN COMBINATION: (A) A SWINGING ARM HAVING (B) A HORIZONTAL DISPOSED PORTION PIVOTALLY JOURNALED ON THE INSIDE SURFACE OF THE DOOR FOR SWINGING ABOUT A HORIZONTAL AXIS PARALLEL TO THE DOOR MOVEMENT, (C) A RADIALLY OUTWARDLY EXTENDING PORTION FROM ONE END OF SAID HORIZONTALLY DISPOSED PORTION ARRANGED TO ABUTTINGLY ENGAGE THE END OF SAID DOOR, (D) AND A LOCKING PIN PORTION FORMED ON THE OUTER END OF SAID LAST MENTIONED PORTION EXTENDING AT RIGHT ANGLES TO SAID RADIALLY EXTENDING PORTION IN A PLANE PARALLEL TO SAID END OF SAID DOOR, (E) A DOOR SILL INCLUDING A LOCKING NOTCH TO RECEIVE SAID LOCKING PIN PORTION, (F) A TRACK ON SAID DOOR SILL FOR SLIDINGLY SUPPORTING THE DOOR, (G) SAID ARM BEING ADAPTED TO BE SWUNG DOWNWARDLY FROM A POSITION AGAINST SAID DOOR END FACE INTO THE BOTTOM OF SAID NOTCH SO AS TO PRESENT SAID LOCKING PIN PORTION IN SAID NOTCH WHEN SAID DOOR IS IN CLOSED POSITION ON SAID SILL. 